Fig. 1: Fabrication process flow of the all-fibre heterogeneously-integrated parametric mixer.
From: All-fibre heterogeneously-integrated frequency comb generation using silicon core fibre
a Tapered SCF with core/cladding diameters of about 5 μm/125 μm. b Heating and tapering process to make the first void gap in the fibre core. c Heating and tapering to make the second void gap in the fibre core. d Fibre tapering process to scale down core size and collapse the void gap to form the nano-spike coupler. e Cleave at the center of the void to remove one side of the taper. f Splice the SCF nanospike to a tapered SSMF. g Employ a polymer tube to mechanically support the SSMF-SCF connection, keeping the fibre straight and tapering the other end of the SCF. h Cleave the other end and (i) splice to another tapered SSMF.
